this post was submitted on 06 Oct 2025
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IpCam and PoE (lemmy.ml)
submitted 3 weeks ago by Donatello@lemmy.ml to c/networking@sh.itjust.works
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Hi,

I have a IP camera that have two power input

a DC 12V and PoE

I've lost the 12V power supply.

So I'm considering to power it trough a simple PoE injector like those

I believe those do not come with a 802.3af negotiation protocol (Not sure) so if those injector directly inject the voltage. (Here 48v) will it work ?

Did you already tried ?

Sorry I know it's not "totally" network related but if you know where I can post I'm all ears.

Thanks.

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[–] KaninchenSpeed@lemmy.blahaj.zone 6 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

You have to check the cameras manual, if it says passive poe and a voltage, then one of these injectors with the correct voltage will work, if it doesn't then you need a active poe injector with at least the required power (af < at < bt).

[–] Donatello@lemmy.ml 2 points 2 weeks ago (1 children)

it say only 12V for the DC.

and for the PoE it said only: PoE (802.3af) and that's it :/

[–] CondorWonder@lemmy.ca 3 points 2 weeks ago (1 children)

There’s your answer: you need an active PoE injector that follows 802.3af. None of the ones you pictured are the correct ones, they are passive not active and worst case can damage your device.

The difference is the active injector and the device communicate to determine how much power to provide, where the passive injectors just whack the device with their rated power. The device shouldn’t work without negotiation (per the spec).